Presentation on theme: "Periodic Trends in Period 3"— Presentation transcript:
1 Periodic Trends in Period 3 Chlorides and OxidesBonding and Structure
2 Position of elements on the periodic table affects the type of bonding.
3 Period 3: Chlorides NaCl, MgCl2, AlCl3, SiCl4, PCl5 increase in the number of electrons available to form bonds.increasing valence e-
4 Chlorides of Metals (NaCl, MgCl2) ionichigh melting pointssoluble in waterdo not react with waterelectrolytes (conduct electricity) as aqueous solutions or molten (liquid)NaCl(aq) Na+(aq) + Cl-(aq)
6 Chlorides of Non-Metals (PCl5, PCl3) molecular/covalentweak van der Waal’s forces between molecules = low melting and boiling pointshydrolysis: to split by the action of waterPCl3(l) + 3H2O(l) P(OH)3(aq) + 3H+(aq) + 3Cl-(aq)non-metal/Cl bond replaced by a non-metal/O bond
7 non-metal chlorides (aq) conduct electricity (but not when molten) Cl2: molecular/covalent, reacts with water in a hydrolysis reactionCl2(g) + H2O(l) HOCl(aq) + HCl(aq)Al: metal, but acts like a non-metal in bondsbecause of it’s high charge, small size ion